#pragma once
#include<iostream>
#include<assert.h>

using namespace std;

namespace bit
{
	class string
	{
	public:
		static int npos;
		typedef char* iterator;
		typedef const char* const_iterator;

		iterator begin();
		iterator end();

		const_iterator begin() const;
		const_iterator end() const;

		string(const char* s = " ");
		string(const string& s);
		~string();


		string& operator=(string& s);

		const char* c_str()const;

		size_t size()const;

		char& operator[](size_t pos);
		const char& operator[](size_t pos)const;


		void reserve(size_t n);
		void push_back(char ch);
		void append(const char* s);

		string& operator+=(char ch);
		string& operator+=(const char* str);

		void insert(size_t pos, char ch);
		void insert(size_t pos, const char* str);
		void erase(size_t pos = 0, size_t len = npos);

		size_t find(char ch, size_t pos);
		size_t find(const char* sub, size_t pos);

		string substr(size_t pos, size_t len);

		void clear();

	private:
		char* _str;
		int _size;
		int _capacity;
	};
	istream& operator>>(istream& is, string& s);
	ostream& operator<<(ostream& os, const string& s);
}

